[Affected versions]: Firefox 57.0a1 (BuildId:20170814100258) Firefox 56.0b3 (BuildId:20170815141045) [Affected platforms]: Windows 10 64bit Mac 10.11.6 Ubuntu 16.04 64bit [Steps to reproduce]: 1.Launch Firefox. 2.Access the https://devtools-html.github.io/debugger-examples/examples/todomvc/ webpage. 3.Open the debugger. 4.Create a breakpoint. 5.Disable the breakpoint. 6.Add a conditional breakpoint on the same line. [Expected result]: The disabled breakpoint is replaced with a conditional breakpoint. [Actual result]: The disabled breakpoint can't be replaced whith the conditional one. [Regression range]: I don't think that this is a regression. [Additional Information] It seems that the conditional breakpoint can only replace the active breakpoint, but the "add conditional breakpoint" is avaliable for the disabled breakpoint as well. Please observe the attached screencast for further information about this issue.

Not a high priority issue but another one we should get fixed.

Thanks Emil, i've copied it to github https://github.com/devtools-html/debugger.html/issues/3730

This should now be fixed on nightly.

I can confirm that this issue is verified fixed on Firefox 58.0a1 (Build Id:20170926220106) and Firefox 57.0b3 (Build Id:20170925150345) using Windows 10 64bit, macOS 10.12.1 and Ubuntu 12.04 32bit.

Too late for 56